/Engine/Source/Runtime/Engine/Classes/Engine/DataTable.h
Output the fields from a particular row (use RowMap to get RowData) to an existing JsonWriter
template<typename CharType> bool WriteRowAsJSON ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< TJsonWriter< CharType, TPrettyJsonPrintPolicy< CharType > > > & JsonWriter, const void * RowData, const EDataTableExportFlags InDTExportFlags ) const